Example:

Perlegen_ID Chromosome Position NB_ref MH63 Zhen_Shan_97 Nippon_bare Probe_name Pos_forward Pos_backward Strand Probeset
CSU17962261 1 196813 T T C T Os.799.2.S1_x_at--702--243 29 -3 + Os.799.2.S1_x_at
CSU17962262 1 197587 C C G C Os.799.1.S1_at--153--1083 35 -9 + Os.799.1.S1_at
CSU17962262 1 197587 C C G C Os.799.1.S1_at--753--623 20 6 + Os.799.1.S1_at

Definition:

Perlegen_ID A unique name of the form "CSUnnnnnnnn"
Chromosome the chromosme
Position Position on Rice TIGR v5 of Nipponbare
NB_ref Base from published Nipponbare sequence
MH63 Minghui 63
Zhen_Shan_97 Zhenshan 97B
Nippon_bare Nipponbare (hybridized)
Probe_name Probe name in the Affymetrix Rice GeneChip microarray, the two numbers are coordinates in the chip
Pos_forward Base position refer to probe. The positon of the first base of probe is defined as Pos_forward=1. For probe is a 25 bases DNA oligonucleotide, 'Pos_forward=29' means the 4th base adjacent the right side of the probe
Pos_backward Base position refer to probe. The positon of the last base of probe is defined as Pos_backward=1. For probe is a 25 bases DNA oligonucleotide, 'Pos_backward=-3' means the 4th base adjacent the right side of the probe